39391897 has 2 divisors, whose sum is σ = 39391898. Its totient is φ = 39391896.

The previous prime is 39391871. The next prime is 39391901. The reversal of 39391897 is 79819393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39388176 + 3721 = 6276^2 + 61^2 .

It is an emirp because it is prime and its reverse (79819393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39391897 - 2¹⁵ = 39359129 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39391897.

It is not a weakly prime, because it can be changed into another prime (39391817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19695948 + 19695949.

It is an arithmetic number, because the mean of its divisors is an integer number (19695949).

Almost surely, 2^39391897 is an apocalyptic number.

It is an amenable number.

39391897 is a deficient number, since it is larger than the sum of its proper divisors (1).

39391897 is an equidigital number, since it uses as much as digits as its factorization.

39391897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 39391897 is about 6276.2964397804. The cubic root of 39391897 is about 340.2532628571.

The spelling of 39391897 in words is "thirty-nine million, three hundred ninety-one thousand, eight hundred ninety-seven".